For those focused on the time differences here. Keep in mind that these are times compiled across sessions (years, really) and different drivers. A time of 8:18 is 498 seconds. A difference of 3 seconds is 0.6%. In other words, it is well within the margin of error when you consider driver, track conditions, and changes in the ring over the years.
The message one should take from this is that the M135i is "comparable" to many of the cars on this list in terms of ability to get around the Nurburgring quickly. I'd consider anything from 8:10 to 8:26 a comparable performing car. What this list *doesn't* tell you is how the cars *feel* when going around the track. You can bet that while the M135i does it quickly, it won't feel as sharp or engaging as the true M cars on that list.
His: 2013 ///M3 - Interlagos Blue Black M-DCT
Hers: 2013 X3 28i - N20 Mineral Silver / Sand Beige / Premium, Tech
Past: 2010 135i - TiAg Coral Red 6MT ///M-Sport